package JavaSE.MSB.Thread.C08_InterView;

import java.util.LinkedList;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

/**
 * 使用wait和notify/notifyAll来实现
 * <p>
 * 使用Lock和Condition来实现
 * 对比两种方式，Condition的方式可以更加精确的指定哪些线程被唤醒
 */
public class T10_MyContainer2<T>
{
    final private LinkedList<T> lists = new LinkedList<>();
    final private int MAX = 10; //最多10个元素
    private int count = 0;
    
    private Lock lock = new ReentrantLock();
    //ReentrantLock 和 synchronized 的最大区别
    
    //Condition就是等待队列，这里等于new了2个等待队列
    private Condition producer = lock.newCondition();
    private Condition consumer = lock.newCondition();
    
    public void put(T t)
    {
        try
        {
            lock.lock();
            while (lists.size() == MAX)
            {
                producer.await();
            }
            lists.add(t);
            ++count;
            consumer.signalAll(); //通知消费者线程进行消费
        } catch (InterruptedException e)
        {
            e.printStackTrace();
        } finally
        {
            lock.unlock();
        }
    }
    
    public T get()
    {
        T t = null;
        try
        {
            lock.lock();
            while (lists.size() == 0)
            {
                consumer.await();
            }
            t = lists.removeFirst();
            count--;
            producer.signalAll(); //通知生产者进行生产
        } catch (InterruptedException e)
        {
            e.printStackTrace();
        } finally
        {
            lock.unlock();
        }
        return t;
    }
    
    public static void main(String[] args)
    {
        T10_MyContainer2<String> c = new T10_MyContainer2<>();
        //启动消费者线程
        for (int i = 0; i < 10; i++)
        {
            new Thread(() ->
            {
                for (int j = 0; j < 5; j++) System.out.println(c.get());
            }, "c" + i).start();
        }
        
        try
        {
            TimeUnit.MILLISECONDS.sleep(200);
        } catch (InterruptedException e)
        {
            e.printStackTrace();
        }
        
        //启动生产者线程
        for (int i = 0; i < 2; i++)
        {
            new Thread(() ->
            {
                for (int j = 0; j < 25; j++) c.put(Thread.currentThread().getName() + " " + j);
            }, "p" + i).start();
        }
    }
}
